[Scons-dev] Tracking down None in SCons environment lists

[William Blevins]

Krew,

It seems that the issue of having dependencies of NoneType.None is rather
common and can be difficult to track down from personal experience. I think
we should consider adding code that throws an exception if NoneType.None is
added via env operations like Append, AppendUnique, Prepend, etc.

For backwards compatibility reasons were someone wants NoneType.None, we
could have both a global check disable and/or an optional parameter to
disable checks.

Any thoughts?

V/R,
William
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